Calibrator



FIG. 1 is an upper front right perspective view of a calibrator showingmy new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevation view thereof;

FIG. 7 is a right side elevation view thereof; and,

FIG. 8 is a lower rear left perspective view thereof.

The broken lines shown in the drawings illustrate environmental subjectmatter and form no part of the claimed design.

CLAIM The ornamental design for a calibrator, as shown and described.